libubus-obj.c

   1 /*
   2  * Copyright (C) 2011-2012 Felix Fietkau <nbd@openwrt.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License version 2.1
   6  * as published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <unistd.h>
  15 #include "libubus.h"
  16 #include "libubus-internal.h"
  17
  18 static void
  19 ubus_process_unsubscribe(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  20                          struct ubus_object *obj, struct blob_attr **attrbuf, int fd)
  21 {
  22         struct ubus_subscriber *s;
  23
  24         if (!obj || !attrbuf[UBUS_ATTR_TARGET])
  25                 return;
  26
  27         if (obj->methods != &watch_method)
  28                 return;
  29
  30         s = container_of(obj, struct ubus_subscriber, obj);
  31         if (s->remove_cb)
  32                 s->remove_cb(ctx, s, blob_get_u32(attrbuf[UBUS_ATTR_TARGET]));
  33
  34         if (fd >= 0)
  35                 close(fd);
  36 }
  37
  38 static void
  39 ubus_process_notify(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  40                     struct ubus_object *obj, struct blob_attr **attrbuf, int fd)
  41 {
  42         if (!obj || !attrbuf[UBUS_ATTR_ACTIVE])
  43                 return;
  44
  45         obj->has_subscribers = blob_get_u8(attrbuf[UBUS_ATTR_ACTIVE]);
  46         if (obj->subscribe_cb)
  47                 obj->subscribe_cb(ctx, obj);
  48
  49         if (fd >= 0)
  50                 close(fd);
  51 }
  52 static void
  53 ubus_process_invoke(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  54                     struct ubus_object *obj, struct blob_attr **attrbuf, int fd)
  55 {
  56         struct ubus_request_data req = {
  57                 .fd = -1,
  58                 .req_fd = fd,
  59         };
  60
  61         int method;
  62         int ret;
  63         bool no_reply = false;
  64
  65         if (!obj) {
  66                 ret = UBUS_STATUS_NOT_FOUND;
  67                 goto send;
  68         }
  69
  70         if (!attrbuf[UBUS_ATTR_METHOD]) {
  71                 ret = UBUS_STATUS_INVALID_ARGUMENT;
  72                 goto send;
  73         }
  74
  75         if (attrbuf[UBUS_ATTR_NO_REPLY])
  76                 no_reply = blob_get_int8(attrbuf[UBUS_ATTR_NO_REPLY]);
  77
  78         req.peer = hdr->peer;
  79         req.seq = hdr->seq;
  80         req.object = obj->id;
  81         if (attrbuf[UBUS_ATTR_USER] && attrbuf[UBUS_ATTR_GROUP]) {
  82                 req.acl.user = blobmsg_get_string(attrbuf[UBUS_ATTR_USER]);
  83                 req.acl.group = blobmsg_get_string(attrbuf[UBUS_ATTR_GROUP]);
  84                 req.acl.object = obj->name;
  85         }
  86         for (method = 0; method < obj->n_methods; method++)
  87                 if (!obj->methods[method].name ||
  88                     !strcmp(obj->methods[method].name,
  89                             blob_data(attrbuf[UBUS_ATTR_METHOD])))
  90                         goto found;
  91
  92         /* not found */
  93         ret = UBUS_STATUS_METHOD_NOT_FOUND;
  94         goto send;
  95
  96 found:
  97         if (!attrbuf[UBUS_ATTR_DATA]) {
  98                 ret = UBUS_STATUS_INVALID_ARGUMENT;
  99                 goto send;
 100         }
 101
 102         ret = obj->methods[method].handler(ctx, obj, &req,
 103                                            blob_data(attrbuf[UBUS_ATTR_METHOD]),
 104                                            attrbuf[UBUS_ATTR_DATA]);
 105         if (req.req_fd >= 0)
 106                 close(req.req_fd);
 107         if (req.deferred || no_reply)
 108                 return;
 109
 110 send:
 111         ubus_complete_deferred_request(ctx, &req, ret);
 112 }
 113
 114
 115 void __hidden ubus_process_obj_msg(struct ubus_context *ctx, struct ubus_msghdr_buf *buf, int fd)
 116 {
 117         void (*cb)(struct ubus_context *, struct ubus_msghdr *,
 118                    struct ubus_object *, struct blob_attr **, int fd);
 119         struct ubus_msghdr *hdr = &buf->hdr;
 120         struct blob_attr **attrbuf;
 121         struct ubus_object *obj;
 122         uint32_t objid;
 123         void *prev_data = NULL;
 124         attrbuf = ubus_parse_msg(buf->data);
 125         if (!attrbuf[UBUS_ATTR_OBJID])
 126                 return;
 127
 128         objid = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 129         obj = avl_find_element(&ctx->objects, &objid, obj, avl);
 130
 131         switch (hdr->type) {
 132         case UBUS_MSG_INVOKE:
 133                 cb = ubus_process_invoke;
 134                 break;
 135         case UBUS_MSG_UNSUBSCRIBE:
 136                 cb = ubus_process_unsubscribe;
 137                 break;
 138         case UBUS_MSG_NOTIFY:
 139                 cb = ubus_process_notify;
 140                 break;
 141         default:
 142                 return;
 143         }
 144
 145         if (buf == &ctx->msgbuf) {
 146                 prev_data = buf->data;
 147                 buf->data = NULL;
 148         }
 149
 150         cb(ctx, hdr, obj, attrbuf, fd);
 151
 152         if (prev_data) {
 153                 if (buf->data)
 154                         free(prev_data);
 155                 else
 156                         buf->data = prev_data;
 157         }
 158 }
 159
 160 static void ubus_add_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 161 {
 162         struct ubus_object *obj = req->priv;
 163         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 164
 165         if (!attrbuf[UBUS_ATTR_OBJID])
 166                 return;
 167
 168         obj->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 169
 170         if (attrbuf[UBUS_ATTR_OBJTYPE])
 171                 obj->type->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJTYPE]);
 172
 173         obj->avl.key = &obj->id;
 174         avl_insert(&req->ctx->objects, &obj->avl);
 175 }
 176
 177 static void ubus_push_method_data(const struct ubus_method *m)
 178 {
 179         void *mtbl;
 180         int i;
 181
 182         mtbl = blobmsg_open_table(&b, m->name);
 183
 184         for (i = 0; i < m->n_policy; i++) {
 185                 if (m->mask && !(m->mask & (1 << i)))
 186                         continue;
 187
 188                 blobmsg_add_u32(&b, m->policy[i].name, m->policy[i].type);
 189         }
 190
 191         blobmsg_close_table(&b, mtbl);
 192 }
 193
 194 static bool ubus_push_object_type(const struct ubus_object_type *type)
 195 {
 196         void *s;
 197         int i;
 198
 199         s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
 200
 201         for (i = 0; i < type->n_methods; i++)
 202                 ubus_push_method_data(&type->methods[i]);
 203
 204         blob_nest_end(&b, s);
 205
 206         return true;
 207 }
 208
 209 int ubus_add_object(struct ubus_context *ctx, struct ubus_object *obj)
 210 {
 211         struct ubus_request req;
 212         int ret;
 213
 214         blob_buf_init(&b, 0);
 215
 216         if (obj->name && obj->type) {
 217                 blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->name);
 218
 219                 if (obj->type->id)
 220                         blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id);
 221                 else if (!ubus_push_object_type(obj->type))
 222                         return UBUS_STATUS_INVALID_ARGUMENT;
 223         }
 224
 225         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_ADD_OBJECT, 0) < 0)
 226                 return UBUS_STATUS_INVALID_ARGUMENT;
 227
 228         req.raw_data_cb = ubus_add_object_cb;
 229         req.priv = obj;
 230         ret = ubus_complete_request(ctx, &req, 0);
 231         if (ret)
 232                 return ret;
 233
 234         if (!obj->id)
 235                 return UBUS_STATUS_NO_DATA;
 236
 237         return 0;
 238 }
 239
 240 static void ubus_remove_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 241 {
 242         struct ubus_object *obj = req->priv;
 243         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 244
 245         if (!attrbuf[UBUS_ATTR_OBJID])
 246                 return;
 247
 248         avl_delete(&req->ctx->objects, &obj->avl);
 249
 250         obj->id = 0;
 251
 252         if (attrbuf[UBUS_ATTR_OBJTYPE] && obj->type)
 253                 obj->type->id = 0;
 254 }
 255
 256 int ubus_remove_object(struct ubus_context *ctx, struct ubus_object *obj)
 257 {
 258         struct ubus_request req;
 259         int ret;
 260
 261         blob_buf_init(&b, 0);
 262         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id);
 263
 264         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_REMOVE_OBJECT, 0) < 0)
 265                 return UBUS_STATUS_INVALID_ARGUMENT;
 266
 267         req.raw_data_cb = ubus_remove_object_cb;
 268         req.priv = obj;
 269         ret = ubus_complete_request(ctx, &req, 0);
 270         if (ret)
 271                 return ret;
 272
 273         if (obj->id)
 274                 return UBUS_STATUS_NO_DATA;
 275
 276         return 0;
 277 }